Federal Reserve Bank of Chicago. "February 1960," Business Conditions (Federal Reserve Bank of Chicago) (February 1960). https://fraser.stlouisfed.org/title/5562/item/540164, accessed on May 14, 2024.
Federal Reserve Bank of Chicago. "February 1960," Business Conditions (Federal Reserve Bank of Chicago) (February 1960). https://fraser.stlouisfed.org/title/5562/item/540164, accessed on May 14, 2024.